package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;


    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        System.out.println(file.toString());
        String originalFilename = file.getOriginalFilename();

        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        // 使用UUID随机生成文件名称
        String fileName = UUID.randomUUID().toString() + suffix;

        File dir = new File(basePath);
        // 判断文件夹是否存在,不存在创建
        if (!dir.exists()){
            dir.mkdirs();
        }
        try {
            // 将临时文件转入指定文件
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }


    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            // 输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len =0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            fileInputStream.close();
            outputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
